want to keep my fiance and new born with me in UK

[Neil H]

I am a British male my girl is Thai we had a baby boy 5 weeks ago,
She came to the UK August 2010 on visitor Visa; we became pregnant Sept/Oct,
In February She was granted a Visa with limited "leave to remain" until 5 Sept 2011 so we could be together to have our baby,
We intend to remain as Fiancé for a couple of years to be sure of each other; we also believe having a child should not make us now rush into marriage.

Another reason for me being sure she is "the one" is I have properties and businesses which I would not like to see being out of my control and half my assets ending up in Thailand.

So here are my questions,

I rang a company (immigrationsolicitor.com) and was told I should be able to get her a visa on family grounds/best interest of child without problem and from within the UK.
Is this correct or just a £1100 bill and unlikely to be successful.

another question is would we be able to get her a 27 month fiancé visa with her having been here on a visitor visa and then a leave to remain visa.

If so would there be a period that her and my Son has to be separated from me and stay god knows where in Thailand. She does have a family but the home is not adequate for those already living in it.
Running my own business makes it extremely difficult to take time off to go to Thailand especially when the duration of receiving said visa is unknown.

I hope I posted in the right place, if not I will more than happy to learn the ropes,

Kindest Regards

Neil.

[vinny]

Perhaps a good chance of discretionary leave due to her British child.